Continuous annealing equipment

A technology for annealing equipment and manufacturing equipment, applied in the direction of heat treatment equipment, lighting and heating equipment, furnace components, etc., can solve problems such as impact, unevenness, and poor wrinkle patterns, etc., to achieve elimination of operational problems, increase in yield, and stable operation Effect

Inactive Publication Date: 2009-12-23
JFE STEEL CORP
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  • Abstract
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  • Claims
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Problems solved by technology

In addition, the temperature unevenness in the width direction of the strip leads to the unevenness of the amount of solid solution C in the width direction of the steel sheet, which has a large adverse effect on the tensile strain of the above-mentioned sinter-hardenable steel sheet and the generation of wrinkle patterns.

Method used

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Embodiment

[0056] A cold-rolled steel strip containing C: 0.0005-0.0025% by mass, Nb: 0.005-0.025% by mass, thickness: 0.65mm×width: 1820mm, passed through figure 1 , figure 2 For the alloyed hot-dip galvanizing production line of the continuous annealing equipment shown, the single-sided heat transfer coefficient (α) is 280W / m after annealing at 820-880°C for 2-4 seconds 2 / ℃ gas jet cooling equipment to quickly cool to 500 ~ 550 ℃, then slowly cool and then perform hot-dip galvanizing and alloying treatment to manufacture a unit area weight of 45g / m 2 (Single-sided) alloyed hot-dip galvanized steel sheet. At this time, the passing conditions of the tension roller after the rapid cooling zone (the number of heating rollers used, the winding angle of each heating roller and the total winding angle) are set as follows: the induction heating device is turned on and off to make the heating roller The number of pieces used was changed as shown in Table 1, and the winding angle was change...

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Abstract

This invention provides continuous annealing equipment which can eliminate temperature non-uniformity along the widthwise or transverse direction of a steel strip at an exit side of a rapid cooling zone having gas jet cooling equipment and prevent the development of a stretcher strain or a wrinkle pattern of a bake-hardening steel sheet. The continuous annealing equipment is a continuous annealing equipment for a steel sheet, at least containing: a heating zone, a soaking zone, and a rapid cooling zone, the rapid cooling zone having gas jet cooling equipment and being provided with at least one pair of seal rolls at each of an inlet and an outlet thereof and bridle roll units each composed of two or more bridle rolls in front of and behind itself; the bridle roll unit behind the rapid cooling zone having two or more heating rolls each having an induction heater thereinside; and the heating roll having a winding angle of 100 DEG or more per heating roll and 380 DEG or more in total of all the heating rolls.

Description

technical field [0001] The present invention relates to continuous annealing equipment, and in particular to continuous annealing equipment capable of uniformizing the temperature distribution in the width direction of strip steel after continuous annealing of steel strip and rapid cooling with a gas injection cooling device. Background technique [0002] For cold-rolled steel sheets, hot-dip galvanized steel sheets, and alloyed hot-dip galvanized steel sheets used in automobile outer panels, etc., the raw material strip steel is usually heat-treated in a continuous annealing furnace and then cooled, or heat-treated and then introduced into hot-dip galvanizing. Coated molten zinc in a zinc bath, controlled to a predetermined amount of adhesion, or after that, introduced into an alloying furnace using gas heating, induction heating, etc., performed alloying treatment for thermal diffusion of iron to the coating, cooled, and then according to It is necessary to perform temper ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/56C21D9/573
CPCC21D9/56C21D9/573C21D1/42C21D9/60C21D8/02F27B9/28F27D99/0073F27D2099/0015Y02P10/25
Inventor 菅野高广安原英子山内崇
Owner JFE STEEL CORP
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